-50.66% is the change from 685 to 338
Calculation steps:
[( 338 - 685 ) ÷ 685] x 100 = -50.66%
Formula
Percentage change = [(338 - 685) / 685] x 100
Subtract the new number by the original number
338 - 685 = -347
-347 ÷ 685 = -0.5065693430656935
-0.5065693430656935 x 100 = -50.66%